You're probably already familiar with one - El Niño. The specific teleconnection we're currently watching is called the Arctic Oscillation. It has to do with the strength of the polar jet stream ...

A negative phase of the Arctic Oscillation allows deep intrusions of colder arctic air down from Canada.

including arctic air outbreaks in the winter. Research has found the Madden-Julian Oscillation, which travels the Earth every 30-60 days, and its position has a significant relationship with the ...

An Arctic air mass kept its grip on much of the central and eastern U.S. on Friday, plunging temperatures to record lows as snow blanketed central Colorado and the Pacific Northwest braced for an ...

BISMARCK, N.D. (AP) — More than 95 million people are facing gripping cold Tuesday as a polar vortex sends temperatures plunging to record levels, closing schools, bursting pipes and forcing ...

Churchill, Canada — Here on the edge of the Arctic in northern Canada, the annual migration of polar bears draws tourists, photographers and scientists like Geoff York. Buggies traverse the ...

At 13,000 tons, the U.S. Coast Guard’s Polar Star is a mammoth vessel made to crash through Arctic ice more than 20 feet thick. But it is the U.S.’s only icebreaker that operates year-round ...

The weather patterns have been very dynamic, with massive ridges and troughs in the jet stream leading to many cross-country storms while shots of Arctic air send temperatures plummeting.

STATEN ISLAND, N.Y. — Despite Staten Island Chuck’s recent forecast for an early spring, it appears that New York City residents must brace for yet another wave of Arctic air. Last month ...

The arctic outbreak that has enveloped the central US is hitting its peak Thursday as frigid temperatures continue to spread south and east across the nation. Extreme cold warnings and cold ...